stratigraphic unit
C1098
concept
A stratigraphic unit is a volume of rock or sediment defined and distinguished from adjacent material by its recognizable and mappable physical, chemical, or paleontological characteristics and its position in the geological record.
All labels observed (62)
| Label | Occurrences |
|---|---|
| stratigraphic unit canonical | 65 |
| sedimentary rock unit | 59 |
| chronostratigraphic unit | 30 |
| geologic group | 23 |
| rock unit | 12 |
| lithostratigraphic unit | 9 |
| sedimentary rock formation | 9 |
| geologic supergroup | 7 |
| lithostratigraphic group | 6 |
| sedimentary rock sequence | 6 |
| carbonate rock unit | 5 |
| tectonostratigraphic unit | 5 |
| Cretaceous stratigraphic unit | 4 |
| fossil-bearing stratigraphic unit | 4 |
| chronostratigraphic boundary | 3 |
| geologic unit | 3 |
| geological group | 3 |
| member (stratigraphy) | 3 |
| metamorphic rock sequence | 3 |
| coal-bearing formation | 2 |
| geological layer | 2 |
| igneous rock unit | 2 |
| subdivision of the Devonian Period | 2 |
| tectonostratigraphic zone | 2 |
| Devonian stratigraphic unit | 1 |
| Mesozoic stratigraphic unit | 1 |
| Ordovician stratigraphic unit | 1 |
| Permian rock unit | 1 |
| Permian stratigraphic unit | 1 |
| Pleistocene stratigraphic unit | 1 |
| Precambrian rock unit | 1 |
| Proterozoic rock unit | 1 |
| Silurian stratigraphic unit | 1 |
| Triassic rock unit | 1 |
| Triassic stratigraphic unit | 1 |
| ammonite zone | 1 |
| biostratigraphic subdivision | 1 |
| biostratigraphic zone | 1 |
| coal-bearing stratigraphic unit | 1 |
| crystalline limestone | 1 |
| epoch of the Quaternary Period | 1 |
| formal chronostratigraphic unit | 1 |
| fossil-based correlation unit | 1 |
| fossiliferous stratigraphic unit | 1 |
| geologic member | 1 |
| geologic series | 1 |
| geological horizon | 1 |
| limestone unit | 1 |
| mass extinction boundary | 1 |
| metamorphosed sedimentary rock sequence | 1 |
| rock sequence | 1 |
| rock succession | 1 |
| sedimentary rock succession | 1 |
| sedimentary sequence | 1 |
| stratigraphic group | 1 |
| stratigraphic level | 1 |
| stratigraphic sequence | 1 |
| stratigraphic subdivision | 1 |
| stratigraphic subgroup | 1 |
| stratigraphic succession | 1 |
| stratigraphic supergroup | 1 |
| subsurface geological unit | 1 |
Description generation (CDg)
The one-sentence description above was generated by prompting gpt-5.1 with the class name and this instruction.
Instruction
generate a one-sentence description for a given conceptual class. # Response Format Return only the sentence: "Description: [one-sentence description of the conceptional class]"
Input
Class: stratigraphic unit
Generated description
A stratigraphic unit is a volume of rock or sediment defined and distinguished from adjacent material by its recognizable and mappable physical, chemical, or paleontological characteristics and its position in the geological record.
Instances (241)
| Instance | Via concept surface |
|---|---|
| Animikie Group | geologic group |
| Neogene | chronostratigraphic unit |
| Hythe Beds | lithostratigraphic unit |
| Lower Greensand Group | geologic group |
| Djadokhta Formation | sedimentary rock unit |
| Barun Goyot Formation | sedimentary rock formation |
| Yoredale Series | lithostratigraphic unit |
| Pliocene epoch | chronostratigraphic unit |
| Morrison Formation | sedimentary rock formation |
| Oxford Clay | sedimentary rock formation |
| South Wales Coal Measures | — |
| Borrowdale Volcanic Group | Ordovician stratigraphic unit |
| Ludfordian Age | chronostratigraphic unit |
| Lochkovian Epoch | — |
| Emsian–Eifelian boundary | chronostratigraphic boundary |
| Givetian–Frasnian boundary | chronostratigraphic boundary |
| Wingate Sandstone | sedimentary rock unit |
| Wahweap Formation | sedimentary rock unit |
| Straight Cliffs Formation | sedimentary rock unit |
| Moenkopi Formation | sedimentary rock unit |
| Coconino Sandstone | sedimentary rock unit |
| Kaiparowits Formation | sedimentary rock unit |
| Grand Staircase of sedimentary rock layers | stratigraphic sequence |
| Table Mountain Sandstone | sedimentary rock formation |
| Temple Cap Formation | rock unit |
| Hermit Formation | — |
| Carmel Formation | — |
| Glen Canyon Group | geologic group |
| Boone Formation | — |
| Diablo Formation | rock unit |
| Temblor Formation | — |
| Glenfinnan Group | metamorphic rock sequence |
| Morar Group | — |
| Torridonian Sandstone | sedimentary rock formation |
| Jurassic | chronostratigraphic unit |
| Etchegoin Formation | — |
| Blair Atholl Subgroup | stratigraphic subgroup |
| Loch Eil Group | — |
| Torridonian Supergroup | sedimentary rock sequence |
|
Lodgepole formation
surface form:
Lodgepole Formation
|
carbonate rock unit |
|
Three Forks formation
surface form:
Three Forks Formation
|
sedimentary rock unit |
| Witwatersrand Supergroup | sedimentary rock sequence |
| Transvaal Supergroup | geologic supergroup |
| Ventersdorp Supergroup | geologic supergroup |
| Kern River Formation | sedimentary rock unit |
| Beacon Supergroup | geologic supergroup |
| Raniganj Formation | coal-bearing formation |
| Barakar Formation | sedimentary rock unit |
| Tennessee marble | crystalline limestone |
| Pelagonian Zone | tectonostratigraphic unit |